NAME

       base32 - base32 standard encoding

SYNOPSIS

       package require Tcl  8.4

       package require base32::core  ?0.1?

       package require base32  ?0.1?

       ::base32::encode string

       ::base32::decode estring

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DESCRIPTION

       This  package  provides  commands for encoding and decoding of strings into and out of the
       standard base32 encoding as specified in RFC 3548.

API

       ::base32::encode string
              This command encodes the given string in base32 and returns the encoded  string  as
              its  result.  The  result  may  be  padded with the character = to signal a partial
              encoding at the end of the input string.

       ::base32::decode estring
              This commands takes the estring and decodes it under the assumption that  it  is  a
              valid  base32  encoded string. The result of the decoding is returned as the result
              of the command.

              Note that while the encoder will generate only uppercase  characters  this  decoder
              accepts input in lowercase as well.

              The  command  will  always  throw  an  error whenever encountering conditions which
              signal some type of bogus input, namely if

              [1]    the input contains characters  which  are  not  valid  output  of  a  base32
                     encoder,

              [2]    the length of the input is not a multiple of eight,

              [3]    padding appears not at the end of input, but in the middle,

              [4]    the padding has not of length six, four, three, or one characters,

CODE MAP

       The  code  map  used to convert 5-bit sequences is shown below, with the numeric id of the
       bit sequences to the left and the character used to encode it to the right. It  should  be
       noted  that the characters "0" and "1" are not used by the encoding. This is done as these
       characters can be easily confused with "O", "o" and "l" (L).
              0 A    9 J   18 S   27 3
              1 B   10 K   19 T   28 4
              2 C   11 L   20 U   29 5
              3 D   12 M   21 V   30 6
              4 E   13 N   22 W   31 7
              5 F   14 O   23 X
              6 G   15 P   24 Y
              7 H   16 Q   25 Z
              8 I   17 R   26 2

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.   Please  report  such  in  the  category  base32  of  the  Tcllib  SF  Trackers
       [http://sourceforge.net/tracker/?group_id=12883].   Please  also  report  any  ideas   for
       enhancements you may have for either package and/or documentation.

KEYWORDS

       base32, rfc3548

CATEGORY

       Text processing

COPYRIGHT

       Public domain